Inkjet recording yellow ink, inkjet recording ink set and inkjet recording method

Abstract

Disclosed is an inkjet recording yellow ink comprising at least one water-soluble azo dye selected from the group consisting of a compound represented by formula (Y) described below and a salt thereof and at least one glycol ether represented by formula (A) described below, wherein the glycol ether is contained in an amount of 25% by mass to 100% by mass relative to a total amount of water-soluble organic solvent in the ink.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2008-245022 filed on Sep. 24, 2008, the disclosures of which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an inkjet recording yellow ink suitable for recording an image by ejecting an ink according to an inkjet recording method. Further, it relates to an inkjet recording ink set and an inkjet recording method each using the same.[0004]2. Description of the Related Art[0005]As an inkjet recording ink, a water-based ink, an oil-based ink, or a solid (fusion type) ink is used.[0006]A dye used in the inkjet recording inkjet is typically required to have the following properties: good solubility with respect to a solvent such as water; good hue; fastness with respect to light, heat and activated gas in the atmosphere (for example, oxidizing ...

AI Technical Summary

Benefits of technology

The invention provides an inkjet recording yellow ink and ink set that can keep the color balance of an image stable for a long time and record an image with excellent storage stability. The yellow ink contains a water-soluble azo dye and a glycol ether, which helps to reduce fading and maintain the desired color tone. The ink set also includes a magenta ink, cyan ink, and black ink, which further enhance the storage stability of the image. The inkjet recording method involves using the yellow ink or ink set on an inkjet recording medium containing inorganic porous fine white pigment particles. The invention solves the problem of fading and color loss in inkjet images and provides a solution for creating high-quality and long-lasting images.

Problems solved by technology

However, if the degrees of fading of the respective colors different from each other under the same environmental conditions with the lapse of time after recording, imbalance in color gradually arises with the lapse of time, which leads to a seriously deteriorated color tone of an entire image.

However, in the aforementioned previous ink compositions, because the yellow dye is especially excellent in fastness compared to cyan dye or magenta dye, sometimes color imbalance in the image tends to occur with the lapse of time after recording, and the color tone of the image at the time of recording cannot be stably maintained for a long time.

Further, in previous ink compositions containing a yellow dye and a glycol ether, many dyes that exhibit a low fastness at an initial stage fade, and change in density at an initial stage is large.

Further, a change of hue owing to fading is so remarkable that an image of a desired color tone cannot be stably maintained.

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